Hygiene mask



FIG. 1 is a perspective view of a hygiene mask;

FIG. 2 is a front elevation view of the hygiene mask;

FIG. 3 is a rear elevation view of the hygiene mask;

FIG. 4 is a left elevation view of the hygiene mask;

FIG. 5 is a right elevation view of the hygiene mask;

FIG. 6 is a top plan view of the hygiene mask;

FIG. 7 is a bottom plan view of the hygiene mask; and,

FIG. 8 is a right elevation view of the hygiene mask illustrating a user wearing the hygiene mask.

The broken lines show environmental subject matter and form no part of the claimed design. 

The ornamental design for a “hygiene mask,” as shown and described. 